3Com 3C63100-AC-C - PathBuilder S600 Bridge/router Reference Manual page 162

162 C 5: C
HAPTER ONFIGURING
P B S600 M
ATH UILDER ODULES
Adaptive (Unstructured mode only)—A non-required network-wide
synchronization technique used to regenerate the input service clock.
Adaptive timing uses a buffer depth indicator at the receiver to adjust the
line rate: the fuller the buffer, the faster the line rate; the emptier the buffer,
the slower the line rate.
Figure 125 illustrates the SRTS and Adaptive timing options.
Figure 125 CBR DSX Timing Options
DS1
-5 Hz
Reference Check
Synchronous Residual Time Stamp (SRTS)
DS1
Adaptive
Idle Timer—The period of time the system monitors traffic activity to activate
the trunk conditioning: 5, 15, 30, 45, or 60 seconds. If there is no traffic
activity for the specified period of time, the system sends out the Trunk
Conditioning (per VC) alarm.
CRC-4 (CBR E1 only)—Enables or disables Cyclic Redundancy Check 4 (CRC-4)
information. CRC-4 is a framing option that checks for errors in data. It is a
communication check for parity/framing and is used for performance
monitoring in E1 networks. CRC4 can be enabled only in structured and
multi-frame mode.
Admin Status—Administrative status: Out of Service or In Service.
c Return to the CBR Configuration menu.
d Repeat steps a and b for the other CBR DSX or CBR E1 ports you want to
configure.
e Return to the CBR Configuration menu.
4 Configure virtual interfaces for the CBR card.
a From the CBR DSX or CBR E1 Configuration menu, select [6] Virtual Interfaces
to open the Virtual Interfaces Configuration menu. This menu is the same as
the MCPU Virtual Interfaces Configuration menu, shown earlier in this chapter,
in Figure 83.
, P , A
ORTS AND PPLICATIONS
Send Difference (-5 Hz)
AAL Header
AAL 1
Buffer
Reference - 5 Hz
Clock
> <
Depends
on Buffer